I found a thread that looks like someone is having the same issue. I'm getting warmer maybe
How is your cooling setup? Do you have any heat monitoring plugins running?
The only sudden crashes I've seen on my Linux boxes lately were due to heat lingering too close to my machine, and eventually my cooling setup not keeping up.
I wouldn't think it's a thermal issue because the system is running fine it's just gnome that crashes
Oh, yeah. You're right. When mine happened, the whole system rebooted.
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